The Lindens, Philip tells Ziggy, "require landowners to disclose if there's mature content on their land by checking a box on the contral panel. As of Thursday, about 15% of the land parcels in Second Life had that box checked, or 18% by land area... Moreover, not all that mature content is sexual in nature... Simple use of swear-words can get content flagged as mature." [emph. mine]

So expressed in terms of landmass, sexual content is significant but narrow. I use the term "isthmus" in the exact geologic sense, as "a narrow strip of land connecting two larger land areas"-- an important but narrow channel of experience, in other words, linking far larger economies together. In particular, fashion and avatar enhancements, on the one hand, and land barons/club owners, on the other. Looking at total landmass is a helpful corrective to the Popular Places display in SL's viewer, which indicates what several thousand of Residents are doing on any given day-- but doesn't necessarily say much about what the hundreds of thousands of other active Residents are doing in-world at the same time. Though we can made some educated guesses, the variety remains a mystery.

I joke that lesbianism is SL's fastest growing religion. RL there are
physical barriers, including the processing of scent, to bisexuality.
In SL, all the signals that lead to it: lack of good men, physical
attractiveness, concern and help, closeness and the need for intimacy,
are heightened, and the barriers are dropped to almost nothing. Hence,
far more female/female relationships turn sexual. I had a very straight
friend of mine point out that on sl, the more subtle forms of touch are
not there, so "hot kissing" is what the game offers for women to be
physically affectionate.